1. Vehicle tracking and monitoring

　　The system has established a rapid, accurate and effective information transmission channel between the vehicle and the monitoring center. The monitoring center can grasp the vehicle status at any time and issue dispatching orders quickly. It can also provide service information for vehicles, and there are a variety of monitoring methods to choose from.

　　2. Overspeed/shutdown alarm

　　Dangerous goods transport vehicles generally have speed limit regulations, and can not stop at will during transportation. The monitoring center can set the limit speed in advance. When the vehicle speed exceeds or is less than the specified threshold, an alarm message will be sent automatically. So that the monitoring center can take measures to control, remind the driver to pay attention to the speed or ask the driver to report the situation.

　　3. Historical track record query

　　The track information of dangerous goods transport vehicles in the process of driving will be recorded and saved for convenience of post query. The user can select the past time period, query the historical data of the specified vehicle in this time period, and perform historical echo. It is a powerful assistant for accident analysis.

　　4. Emergency alarm

　　When the vehicle encounters an emergency, just press the alarm button, and the on-board terminal will automatically send alarm data to the monitoring center. The monitoring terminal will display the vehicle position and give an audible and visual prompt. In addition, in case of danger, traffic accident, vehicle failure, etc. during driving, you can call for help from the monitoring center through the alarm button of the on-board terminal. The monitoring center can also monitor and record the conditions in the vehicle.

　　5. Area/yaw alarm

　　In order to strengthen the dispatching management, vehicles are generally required to travel on fixed routes or only in specific areas. The driving route is preset for the task vehicle in the system. At the beginning of the task, the driving route and status of the vehicle begin to be monitored and recorded. If the vehicle fails to drive according to the preset driving route or drives out of the set area, the system will automatically alarm, and the center can take measures according to the actual situation.

　　6. Unified vehicle information management

　　The system enables centralized and unified information management of vehicles. The management content covers vehicle license plate number, vehicle platform number, vehicle model, color, engine number, chassis number, purpose, etc. The system will collect and input all the information of the vehicle, and then provide users with the functions of modification, deletion and query.

　　Overview of GPS Distributed Real time Acquisition System

　　As Donghai Bridge is located in the open sea, it not only needs to withstand seawater corrosion, earthquake and typhoon natural disasters, but also various traffic tools to cause slow damage to the bridge structure. The bridge is monitored in real time to know the health status of the bridge in time, respond to various emergencies, and carry out necessary maintenance work to extend the service life of the bridge. The monitoring data can also be further studied and analyzed, which is of great help to the basic research of the bridge.

　　Why use clock synchronization technology? As the bridge is a special structure with a wide range of structures, monitoring points are scattered everywhere, and many monitoring items have real-time characteristics, such as earthquakes, typhoons, traffic accidents, etc. The monitoring data of various parts need very accurate time synchronization, and the general data acquisition technology cannot meet the monitoring requirements. If the clock synchronization technology is not used, It is very likely to cause a small error in the time of data collection at each monitoring point, which not only causes inaccurate monitoring results, but also seriously affects the research and analysis of bridge health. The GPS clock synchronization technology can completely avoid these problems.

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